Ábrahám Levente (szerk.): Válogatott tanulmányok VI. - Natura Somogyiensis 19. (Kaposvár, 2010)
UHERKOVICH A.: Further distribution data to the molluscs (Mollusca) of Southwest Hungary
84 NATURA SOMOGYIENSIS Discussion In the last 10 years, we collected 121 taxa in 114 sites of SW Hungary (South Transdanubia). The majority of these materials consists of empty shells. Some of the taxa seem to be fossil or subfossil. The waterflows transported empty shells far away from their original habitats. Thus Platyla banatica (Rossmässler), Pupilla triplicata (S. Studer) and Mediterranea hydatina hydatina (Rossmässler) probably do not breed on the investigated area, they arrived from the Mecsek Mts. and Zselic Downs. The rare Lucilla singleyana (Pilsbry) and Helicopsis striata striata (O. F. Müller) were also collected along river banks, so, their breeding areas are also unknown. Aegopinella nitens (Michaud) was also collected along the riverside of Danube. We suppose this species arrived from the Szigetköz, where it is relative frequent. Aegopis verticillus (Lamarck) and Amphime/ania holandrii (C. Pfeiffer) breed only on the marginal region of the examined area. They were collected in the westernmost parts, where several occurrences were known earlier. First occurrences of Bithynia troschelii (Paasch) published recently from Hungary (GLÖER and FEHÉR 2004), also known from the marginal areas of South Transdanubia. Due to the difficulties of identification, we have only few data on Pisidium species. The 7 species recorded in this paper were identified by Dr. G. Majoros. The waterflows may wash out fossil shells from their beds like Orcula dolium dolium (Draparnaud), Vallonia declivis Sterki, Pupilla muscorum bigranata (Rossmässler), Pupilla sterrii (Voith), Vallonia enniensis (Gredler), Pupilla muscorum (Linnaeus) and Chondrula tridens tridens (O. F. Müller). Acknowledgements The author are grateful to Dr. Sára Nógrádi for her help in field work. I express my thank to Mr. András Varga and Dr. Gábor Majoros either for their help in identification.
